[bug#35081] [PATCH] gnu: Add emacs-protobuf-mode.

[Carlo Zancanaro <carlo@zancanaro.id.au>]

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Attached is a patch to add emacs-protobuf-mode, a major mode for 
editing Protocol Buffer source files.

I opted to add it in protobuf.scm instead of emacs-xyz.scm because 
it comes bundled with the protobuf source, and thus can share a 
source field.


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From de6067629a17c5884cc9e369a9ce0d4eafdd9f6a Mon Sep 17 00:00:00 2001
From: Carlo Zancanaro <carlo@zancanaro.id.au>
Date: Fri, 28 Dec 2018 18:46:21 +1100
Subject: [PATCH] gnu: Add emacs-protobuf-mode.
To: guix-patches@gnu.org

* gnu/packages/protobuf.scm (emacs-protobuf-mode): New variable.
---
 gnu/packages/protobuf.scm | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/gnu/packages/protobuf.scm b/gnu/packages/protobuf.scm
index 73169216b4..3299299705 100644
--- a/gnu/packages/protobuf.scm
+++ b/gnu/packages/protobuf.scm
@@ -27,6 +27,7 @@
   #:use-module (guix build-system cmake)
   #:use-module (guix build-system gnu)
   #:use-module (guix build-system python)
+  #:use-module (guix build-system emacs)
   #:use-module ((guix licenses) #:prefix license:)
   #:use-module (gnu packages compression)
   #:use-module (gnu packages gcc)
@@ -208,4 +209,21 @@ mechanism for serializing structured data.")
 
 (define-public python2-protobuf
   (package-with-python2 python-protobuf))
+
+(define-public emacs-protobuf-mode
+  (package
+    (name "emacs-protobuf-mode")
+    (version (package-version protobuf))
+    (source (package-source protobuf))
+    (build-system emacs-build-system)
+    (arguments
+     `(#:phases
+       (modify-phases %standard-phases
+         (add-before 'set-emacs-load-path 'change-working-directory
+           (lambda _ (chdir "editors") #t)))))
+    (home-page "https://github.com/google/protobuf")
+    (synopsis "Protocol buffers major mode for Emacs")
+    (description
+     "This package provides an Emacs major mode for editing Protocol Buffer
+source files.")
+    (license license:bsd-3)))
-- 
2.21.0